MAINE SARDINE INDUSTRY. we 
volatile alkaline material in a catch of plankton, which consisted 
almost entirely of diatoms, is also given. The rate of decomposition 
of fresh-water herring is included for the sake of comparison with the 
rate of decomposition of the feed alone. 
In each case as many determinations were made as were possible 
with the amount of material at hand, which was not often large 
because of the difficulty of obtaining any kind of feed unless the 
water was very quiet. The amount of total volatile nitrogen found 
before incubation was so small that it seemed unnecessary to deter- 
mine amine nitrogen. 
TABLE 7.—Ammonia and amines per 100 grams in feed of sea herring. 
Held in incubator. 
When taken. 
24 hours. 48 hours. 72 hours. 
Feed.! 
Am- Am- Am- - 
Total.| mo- renee Total.| mo- am Total.| mo- RGS Total.| mo- el 
nia = nia. nia. ; nia SED 
Plankton from Woods Hole, 
Mass., kept at 30° C.| Mg.| Mg.| Mg.| Mg.| Mg.| Mg.| Mg. | Mg.| Mg.| Mg.| Mg.| Mg. 
(chiefly aiatoms)ts2.eees. DRONE 8 3 Bae ig ee os S| 2 Soe) a ate a) ta hs ONE ae Bee ARAN Se etre Sek 
Plankton from St. Croix 
River off Campobello Is- 
Pana ehiofiy, COpEpOUs) <> |piGs 04 \ecse sal tss ec eget [scctae wee | etere ais | ale clase linear alte eile AQ 252 | daateers clear 
Copepods from east and 
sont of Campobello Is- 
Manianisn. co denennce eins s| cs scicl sosee aeRe ae ZAGSOKPSS SB lle O2a8 |eateroale teste alerts oles oi ol meseite | mseie sc 
Copepods from north end 
of Grand Manan in very 
deep water............... O70 eee cclsaeaae 191.7} 143.4) 48.3) 296.8) 260.9) 35.9)...... [Soho ares 
Schizopods from Wilson’s 
Beach Island, off Campo- 
Bellows Ser a re) 25) POS ee sells eae ees Ses ee Sate ee MS SSS Sunes 822.9) 602.3] 220.6 
Schizopods from Wilson’s 
Beach Island, off Campo- 
[OTe) (See es as a ey Bs GO wekellele see 220.4) 88.2) 132.2) 787.6) 573.7) 213. 9/1009. 2} 832. 6) 176.6 
Feed taken from _belly- 
blown fish at wharf, East- 
DOL; Mees a2 ys es mY (a Ae) 17 PAO seein eliao mods ORO! Flloop eee SE Sces eaocma nooriec seca ascke 
Fresh-water herring from 
Taunton River, Taunton, 
MASS 29 Fe ea. ce Say 9:94: tack levee 127. | LIU alee tl SSeS See Gediiscdoce 888. 3] 812.6} 75.7 
1 Samples were kept at incubator temperature (37.5° C.). 
Both ammonia and amines in very large quantities were found in 
the decomposing feed, schizopods and copepods. When allowed to 
spoil under these conditions and to the extent that took place during 
a period of from 48 to 72 hours, ammonia was found in much larger 
amounts than amines. From the limited number of determinations 
it was possible to make it was apparent that little difference, if any, 
exists in the rate of decomposition or in materials formed between 
copepods and schizopods. Considering the similarity of composi- 
tion of the two forms, it is quite probable that no difference in 
degree or kind of decomposition would be found. The examination 
of the feed taken from the viscera of belly-blown fish gave results 
