4104 Merchandise by Adam
This was quite a difficult puzzle to complete. The clues were well written and it was fairly easy to fill the grid, despite the jumbled across entries. Finding the 11 embedded words was more of a problem. The quote was hidden in every third cell downwards by column. This was a quotation from Through the Looking Glass by Lewis Carroll.

“He said “I look for butterflies
That sleep among the wheat”

The verse continues.
I make them into mutton-pies
And sell them in the street”

Thus the merchandise that had to be written below the grid was MUTTON-PIES.

Across
1 You need only missing leg for a genus of spiders (6)
LYCOSA (on)LY COS + A
6 Skin stain displaying artifice? Not once removed! (5)
CHICA CHICA(ne)
10 Lovers getting cordial in Alps? Maybe! (9)
PLATONICS TONIC in Anagram ALPS
12 Like a hog’s back it’s dry, powerless (6)
ARCHED (p)ARCHED
14 He holds a note that is high (5)
HAUTE A UT in HE
15 Assault force coming to a swallow hole (6)
DOLINA DO + LIN (force/waterfall)+ A
16 Fifty per cent loss of capital leads to airline that’s grounded? (5, two words)
PAN-AM PANAM(a city)
17 Like a cathedral may be fated, nothing less (5)
DOMED DOOMED less O
18 Calls old golf club after king has left, then prince succeeded (6)
CLEEPS CLEEK less K + P (prince) + S (succeeded)
19 Lays about extremely sparse circles (6)
BESETS S(pars)E in BETS
21 Inspiration is crucial for such yoga; the bard’s spouse’s way off (5)
HATHA HATHAWAY less WAY
22 Water will acquire approval and carry weight for enzyme (9)
UROKINASE OK and AS in URINE
26 Country gentleman leaving Society some papers (5)
QUIRE (s)QUIRE
28 One in pancake mixture (6)
BATTER 2 definitions ref. cricket
31 Attaching out-of-date study makes this union baffling (6)
FUSING (con)FUSING
32 Arizona spinney the setter goes round too much (5)
MOTTE OTT (over the top) in ME
33 Fashion of old shows retiring soldier is getting into wetland (5)
FEIGN GI reversed in FEN
34 One partners fish from within (6)
INSIDE I (one) + NS (bridge partners) + IDE
35 Keeps away from contracts lacking basic signature (5)
FLEES FLEXES less X
36 In Glasgow, touts sex appeal to help out animal lover (6)
PETSIT PETS + IT
37 Boy’s dry about local relative (9, two words)
WELSH AUNT SHAUN (a boy) in WELT
38 Those drinking too much take latitude in bars (5)
SLOTS L in SOTS
39 Put on artist’s retrospective — about time! (6)
STAGED T in DEGAS reversed
 
Down
1 Embarrassed to show up in trailer (7)
ASHAMED SHAME in AD
2 Yankee is led astray generating returns (6)
YIELDS Y (Yankee) + Anagram IS LED
3 Essential feature of a computer — there’s one in unlimited wooden surround (6)
OP-CODE PC in (w)OODE(n)
4 String along with an African chief in European city (7)
CORDOBA CORD + OBA
5 Brown breaks English society up — a gem from Scotland? (5)
STANE TAN in E + S reversed
6 Man of harmony in possibly thin medication (8)
INHALANT ALAN in An agram THIN
7 Fish gather together, leaving marks on local stream (6)
CLUPEA CLUMP less M (marks) + EA
8 International company is a success, one with style (almost) (7)
HITACHI HIT + A + CHI(c)
9 Incomplete group of badgers holds bird in fireside utensil (6)
CHENET HEN in CET(e)
11 In Scotland, irregular river pageant finishes early (6)
CAMSHO CAM (the river) + SHO(w)
13 Entomologist put down sitter, being shaky (9)
DIPTERIST DIP + Anagram SITTER
20 Playing of fugues with both hands is gushing (8)
SURGEFUL Anagram FUGUES + R&L
22 Hair feature, this one for altering, somehow? (7)
RINGLET Anagram ALTERING less A
23 Sense of repose experienced after docking rustic horse (6)
KEFFEL KEF + FEL(t)
24 Prosody unit impedes working (7)
SEMIPED Anagram IMPEDES
25 It’s a cracking speed for a group of flightless birds (7)
RATITAE IT + A in RATE
26 Awfully dry, these mosses may show a sort of tautness (6)
USNEAS Anagram TAUTNESS less TT (dry)
27 Even trapping special Highland birds (6)
QUISTS S in QUITS
29 Getting the body into shape shows the fate of Palamedes (being beheaded) (6)
TONING (s)TONING (ref. Palamedes who was stoned to death)
30 Bravo! Returning European sprinkles gently (6)
BEDEWS B + SWEDE reversed
32 Female prisoner discharged by Italian noblewoman (5)
TESSA (con)TESSA