30 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
and crucians in nearly all the breeding ponds in Scblaupitz.) As a cause of this I 
would ineutiou the possible effects of an abnormally high temperature after a thorough 
contamination of the waters by manure during the melting of the snow. The water 
which, tilled the pits rvas supplied from our ponds. The result was, in pit No. 1, 20; 
in pit No. 2, 15; and in pit No. 3, 25 young cyprinoids; of these, 9 in pit iSo. 1, 10 in 
pit No. 2, and 6 in pit No. 3 were gennine crucians; 5 in pit No. 3 were genuine scale 
carps; the balance were more or less Carpio I'ollari Heck. 
A fourth clay pit, also a perfectly constructed pond, ayus stocked, exactly as stated 
above, with hybrid carps and scale carps, after it had been divided by high embank- 
ments (brick walls) into three approximately equal ponds. Those showed apparently 
somewhat more oftspring than the aboAm-mentioned hybrids, but also in this instance 
more than one half Avas lost, so that I could get oirt of — 
A (2 females of Carpio koUari X 1 male of Ci/prinus cfupio) 30 specimens. 
B ( 1 male of Carpio Icollari X 2 females of Cyprin us carpio ) 50 specimens. 
C (1 male of Carpio koUari X 4 females of Carpio koUari) 20 specimens. 
Of these I consider that in A there were 15 specimens, in B 35, and in C 3 that were 
tyiiical carps; in C there were 5 genuine crucians; the remainder were half crucians in 
various gradations, but much nearer — in A and B almost without exception — to the 
Cyprin, us carpio than to the G. mrassius. 
The experiment with the Alburnus leydigii had to be made in ^‘Lund” hatching 
troughs, as I had to use the other pits for other experiments. 
In No. 1 I placed 1 male of Leucaspius delinea tus and 2 females of A/5, leydigii. In 
No. 2 I placed 2 females of Leucaspius delineatus and 1 male of Alh. leydigii. I did not 
haA'e more of these little Irsh. 
Results: In No. 1 there were 60 fry, 51 of Avhich were Leucaspius delineatUa. In 
No. 2 there were 40 fry, 34 of Avhich were Leucasptius delineatus. 
The circumstance is Amry remarkable that almost all these stock fish, Avhile in all 
other respects true “ Moderrapfen ” {Leucaspius), inherited the perfect lateral line of 
Alh. leydigii, and in the few others this line reaches quite far back. 
I would call the attention of the reader to the fact that years ago I often obtained 
in the Upper Zobten waters Leucaspius delineatus with a ijerfect lateral line. 
Of Alburnus lucidus x Leuciscus erythrophthalmus as Avell as Leucaspius delineatus 
xLeuciscus rutihis {Leuciscus carii) 1 had only one specimen each; the experiments 
made with them did not giArn. any results, though I hope in future to also obtain 
offspring from them. It is true many objections can be made against this latter 
assumiAion, as Claus says: 
The hybrids only form intermediate stages Avith disordered generative organs withont prospect 
for offspring, and even in case of fertility, which was often observed in female hybrids, they revert, 
back to the paternal or maternal species. 
SCHLAUPITZ, August 1S93. 
