442 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [16] 
TABLE VI.—Average change of weight of female Rhine salmon. 
Date. May 22. June4. Junel9. July4. July 19. Aug3. Aug 23. Oct. 12. 
Days from May 22...- 0 15 30 45 60 75 95 140 
Wreighteessssscsa-e- 108.17 107. 74 107. 39 107. 08 106. 66 106.7 104. 61 100 
d=0. 0287=0. 0233=0. 0207 0. 0280=0. 0393=0. 0730=0. 0922 
The principal result, which is apparent in all six divisions, obtained 
from Tables IV to VI, is this, that from the end of July or the beginning 
of August, when the ovarium weighs on an average one-fifth of its 
mature weight, till the spawning season, there is, in spite of the growth 
of the ovarium, not only no increase of weight, but even up to October 
12 a decrease of weight of 6 per cent. (weight on the 12th October 
=100); for every pound of ovarium more than a pound of flesh has 
vanished. As the intestinal fat has mestly disappeared about the be- 
ginning of August, and as the changes of the intestines (as has been 
proved by numerous observations of weight) are of very little conse- 
quence, the muscle flesh alone must be the source from which the sub. 
stances come. , 
The quantity of albumen contained in the large side-muscle of the 
body was, therefore, determined by observations taken on a number of 
July and August salmon and compared with a series of similar obser- 
vations taken on November salmon (7. ¢e., the quantity of the dry resi- 
due which, at a temperature of 110°, remained, after complete ex- 
haustion by means of hot alcohol, ether, and water). 
TABLE VII.—Decrease of the quantity of dry substance and albumen in the large side-muscle 
of the female Rhine salmon from July and August till November and December. 
oon | Contents of the 
ae side-muscle. 
es 
bb HR H o 
B | Bs | a. | ge 
2 a a so 
SH 7 -o ne 
: = ey Bw | 28 
a om) =| =| 
= a AE Bo ae 
oo RS > BO H 
S01 Bulges ten aes 
A E S < A 
Milli- 
meters. | @72ms 
Muteh ‘salmon; March 18; 1880.20. -22. scence cco cooesee ne = 885 | 9,580 0.045 | 18.8 34. 6 
Basel salmon, March 30, 1880. .----..2..-2-2<2cccceecncce=ne 860 | 9, 030 0.077 | 18.1 32. 6 
BACVBP EE O)ieicinicinio S| <ic.ocwciwisisin's 25 cla & cid a ceia sane aie imeiniom mien enismlate ssremieleleinictatetstalaicteteta(aiettieetaiats | 18. 45 | 33. 6 
PLEO LS Niers lee cisinialateinle diormcais ticlohnicisie Men icce em aeerne eras 865 | 8,700 4. 04 17.2 | 24. 2 
QRS Ope eieteciam siatein ner wicin ete cin eis cals ete ate Cee eee eee 874 | 8, 560 3.40 18.2 | 27.5 
eel BO eetele stele nieielaicisjewsinis cia axle se late ee tase eae ee eres 908 | 10, 270 3. 32 Lie 28.9 
JNO Me Ue Sap op SOCK ESE DEPOEE BEDE Rea gadscsnpccoDdne 940 | 11,130 7.21 18.7 29.0 
POT k sac ccec ce asin Seabee s Get ecosseecemerineeinae 858 | 7,340 4.29 17.3 26.6 
RSTO ose memiwa = cise cc wFicinic sic’ cle wicln.c/e mers Se eee 878 | 8,930 3. 13 16.7 2007) 
POMS TO atecmcisiaicieniniviain(e sat). cu sic'sjs 5 — scien eeeray 883 | 7,740 6. 52 16.5 21.8 
Average of the Basel salmon during July and August ...----..------------ is 4.78 | 17.5 | 26.8 
