30 BULLETIN 824, U. S. DEPARTMENT OF AGRICULTURE 
Gehe & Co. (92) give the following results of the analysis of asample 
of insect powder from Dalmatia: Soluble in alcohol, 26.35 per cent; 
insoluble in alcohol, 56:27 per cent; water, 8.45 per cent; ash, 8:93 
per cent. As they themselves state, this analysis is worthless in 
determining whether the sample is genuine or not. 
Mill (132), 1894, stated that genuine Dalmatian insect powder has 
a greenish-yellow color, possesses a characteristic tealike odor and a 
slightly bitter, aromatic taste, and shows on analysis from 8 to 10 per 
cent of moisture, and from 6.5 to 7 per cent of ash, which is almost 
entirely soluble in hydrochloric acid. 
Dieterich (69) records analyses of a number of samples of insect 
powders, including a determination of the maximum size of the par- 
ticles in microns. He sets the following limits for a good commercial 
insect powder: Maximum size, 255 microns; moisture, 5.55 to 13.95 
per cent. In the Erstes Dezennium der Helfenberger Annalen, 
1886-95 (page 420), as the average of all determinations made on 
insect powders during that period, the following are given as the 
limiting values: Moisture (loss at 100° F.), 5.55 to 13.95 per cent; 
ash, 6.07 to 8.70 per cent; potassium carbonate in ash, 28 to 38.33 
per cent; maximum size of particles, 109.44 to 175.50 microns. 
TaBLE 13.—Chemical analysis of insect powders (Dieterich) 
Determination 
: ais ~ Maximum 
ample No. ear : size of 
oa: eth rp BG Oaa eee cles 
100°) 2S 
Per cent | Per cent | Per cent Microns 
Posen Acs chal a ee a RE ae we ARE, A pe RR ID ot 9. 55 8. 35 23. 47 179. 55 
PAS he! AE ERS EE NER Se sae SES Oe een ie wees 1896 8. 25- 7.69 31. 57 255. 15 
Bee ae I Sb Sie Seas hm Sel ie RRC Se nd el eg Bene 11.18 7. 58 30. 96 151. 20 
Figsirg eo ha BOE alo oO SRE eel See Cee LW oe 194 Be (53S 33. 80 190. 35 
Fei gpsk Ge STS Bae ae ee ERR SN TOR Mere mete ry henen ee es rein Le TS 1897 9. 53 6. 61 38. 05 139. 05 
By 5 ne ees eee ER Sa gs esa PCE eee 11. 12 7. 45 17. 01 153. 90 
A sae i Ne on he ae ae oy EAT, ewe eA 10. 60 6. 80 33. 51 141. 75 
TESs Seite 2 eo wig beatae Neale ere Dae cee ee ae Lt a a eel ad 11. 26 8) 06 teens 148. 50 
DARE as oe pia a pe SES Sips ae ee a 6.95 Gia OTe 311. 85 
2 Ee ne ee OS Be Pea eee oe Oe ep a See Ed NN Leg Tn dl eka (alts s| est ea 302. 40 
Ary PS As Fo) Bp ol og Bore Spl ice fehl a a Np EI 1900 9. 93 1256s ee eee 141. 75 
pee meee te te ak os Sa ae nye Senter ee ee pee 9, 33 $5750 eee PHD 
0 Sa Ce are ROR Se IB oe i Pe ae 638s sees ee 155, 25 
Ulett NEE SNS pe Se rE, Se REELS He ce Rie age Tee) 7. 43 6: 9Ocioe ee 1S8. 45 
iE SAB Seas EE OF NA Se Apa SEE EE Sa ae 10. 33 6: 654M Sa 8 ae 198. 45 
7 A ap ate is eg ag ae RO RNG es ae OS OER et SIE Ne, SRS gk 1901 11. 97 L603, 22s 145. 50 
oo ACE Bs BAN The g Dl se Stee ah a td a 9, 28 QE) AE RS eee ee 
AS SER Eee OE oe EEE Sa we SP Re ee ee a Gam | ee ee 9°63) |2 2322S eee 
[ peaiy Set ee ee Seemed 5. 8 peed: oer te tied RemRa Nard ea end Exe 7.97 7 01s |e 202. 50 
PC Ss Vittles cSt aes Opp Rand Sees SP of 2 ay UE Non Bn Bh Rec ae 1902 8. 83 6529" [a eee ee 135. 00 
9 Sea nines eR See i, SF sr Sele RS al Nate are Ee NS ote Men 10. 52 GG st Sse eee 67. 50 
1 ER ia acre SMe EN al ihc Seppe pay 5 ae EI ANT, pn SS Le. 10. 04 17 40-|2 Sees 190. 35 
Ae, ee ae Cs neo Ry EE Spe ES Lee ee ee 1903 8. 57 Gl7b ae = 162. 00 
5 ues ree ee pee en es on Sparen Me eA ee ae bec rhe 9.05 ((2305|Seseen ees 135. 00 
3 Gl Ae oe Seale Se een Sen Reeder Me ee LAE ee eee 7 a el See 2 2 1904 8. 81 Grabs ae ee 162. 00 
In the Helfenberger Annalen for 1902 (page 186), Dieterich reports 
the results of the determination of the ether extract of insect powders, 
using the method of Fromme (85), in which 8 grams of powder are 
treated with 80 grams of ether of specific gravity 0.720 at 15° C., 
shaken at intervals during 1 hour, then 50 grams (5 grams powder) 
shaken with 1 gram of water and filtered. The filter is thoroughly 
washed with ether, and the filtrate evaporated and weighed. The 
a. ae 
a var 
