86

veloped so large as to crowd out the rest of the body.

The various acids, chemicals, and bacterial poisons used seem to act upon the multiplied egg, after it has sub- divided many times into a com-, pound egg. These are fragments bro- ken off by the poi- sons in the blood of the mother, and the particular di- visions which are poisoned cause the malformations and freaks.

Making Hens Lay Double Eggs

Examples of eggs Avithin eggs have been attributed to the serpentine movements of the flexible canal through which they pass. Hens fre- quently lay several double eggs in suc- cession. Fere, a distinguished i n - vestigator, claims that he succeeded in producing double eggs in a hen which normally laid single eggs, simply by drugging her with belladonna. Glaser, another biologist of note, has de- scribed the ovary of a hen which habitually laid dou- ble eggs and con- cludes that fusion is the explanation of some double

The one which Professor Chiches- ter wishes to re- cord is a "gourd- shaped" egg. Pro- fessor Hargitt studied one, which was not preserved carefully, and on account of evap-

���A twin dog-fish, the result of some chemical effect upon the egg

���A twin fish

starting to

develop

��A double head in process of formation TADPOLE MONSTERS

��Popular Science Monildy

oration, the condition was such that he could not be certain of the presence of yolk in the smaller end. He assumed that the egg was comprised of about normal parts in the larger end, and that t h e smaller con- sisted of only al- bumen , "its yel- lowish tint having resulted from the evaporating proc- ess which had tak- en place."

Alany cases of twins and double monsters in fish have been recorded but no case of ap- parent modifica- tion of structure by chemical means in one of the twin fish mentioned. Dr. Chichester fertil- ized the eggs from several female F u n d u 1 i by the sperm of one male and at the proper stage, he added a dilute solution of ether in plain sea- water. Many of the eggs died. Two days later the water was changed for fresh sea-water and a few of the dead eggs were removed. Three days from the beginning of the experiment the dead eggs were picked out, and the remaining few were placed in fresh sea-water. The living eggs numbered two hun- dred and fifteen, and the uncounted dead eggs about six hundred. At the end of six days' time the normal embryos were sep- arated from the abnormal.

In the first lot

��How quad- ruple eyes grow

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