TRANSACTIONS OF SECTION D. 1071 
The pigment has no causal relation in the nuclear changes, as they are found 
(more especially in the lower pole), in the absence of pigment. 
Thus although the author has been unable to trace the detailed changes of 
karyokinesis in the diyision of the nuclei in the frog’s ovum, he has observed 
appearances associated with a substance which stains in carmine, which to some 
extent harmonise with it: From a nucleus which has arrived at a certain stage a 
substance escapes into the surrounding part of the segments, and there becomes 
a centre of an area in which the yolk tablets are dissolved and a new nucleus 
forms, this nucleus passing through the various stages above described. The 
newly formed nuclei have the power of dissolving the yolk tablets, of assimilating 
the substance of the segment, of becoming the centres of currents which must 
have an influence on its nutrition, and which probably are intimately connected 
with the subsequent division of the segment that succeeds the development of the 
new nuclei. Nuclei observed in ova which were divided into four segments, and 
in those which after eighteen to twenty-four hours had developed into the monili- 
form or mulberry stage, show that the stages of development are the same in both 
instances. 
12. On the Structure and Arrangements of the St. Andrews Marine 
Laboratory. By Professor McIntoss, M.D., DL.D., F.R.S. 
The marine laboratory at St. Andrews was formerly a temporary wooden fever- 
hospital, 60 feet in length, but as it was only used for a few months some years ago, 
it was readily obtained for its present purpose. The accommodation consists of a 
tank-room, two work-rooms, a larger and smaller, an attendant’s room, and engine 
house. Sea-water is obtained from the sea, which comes within a few yards of the 
laboratory, by means of a gas-engine, vulcanite pump, and pipes. The sea-water is 
first pumped into a granolithic underground tank, then to a high-level cistern, from 
which it runs by gravitation through the tanks. The latter are at different levels, 
and various supplementary vessels are easily added as required by resting them 
over the tanks and leading the sea-water into them by india-rubber tubes. The 
situation of the laboratory, which is on a narrow tongue of sand between the 
harbour and the sea, is most favourable, since the fishing-boats supply many 
interesting specimens on the one hand, and the beach is rich in marine life, both 
amongst the rocks and in the sand. 
13. Remarks on the work at the St. Andrews Marine Laboratory during 
nine months. By Professor McIntosu, M.D., LL.D., F.R.S. 
Amongst mammals several porpoises were examined, one a full-grown female 
5 feet 2 inches long, recently delivered and full of milk. The rich yellow milk 
was examined by my colleague, Professor Purdie, who found in 100 parts by 
weight—water, 41:11; fat, 45°80; caseine, 11:19; milk sugar, 1-33 (?); mineral 
salts, 0:57. 
The detailed study of the development of many of the food fishes has been 
carried out by Mr. Prince. These include the cod, haddock, whiting, gurnard, 
common dab, and common flounder. The ova and development of other fishes 
were likewise examined, ey., rockling, lump-sucker, Cottus scorpius, Montagu’s 
sucker, 15-spined stickle-back, herring, bib, ling, eel, skulpin, gunnel (Yarrell’s 
blenny), wolf-fish, viviparous blenny, and glutinous hag. The young of many 
fishes from the rocks were kept under observation, and the food and parasites of 
others both in their young and adult condition received due attention. 
The reproductive organs and development of various annelids, starfishes, 
ascidians (including Pelonata corrugata), crustaceans, and mollusks (including the 
common mussel of Mr, J. Wilson), were studied more or lesscompletely. Artificial 
fecundation had to be resorted to in the case of the common mussel by Mr. 
Wilson. 
1 Chemical News, Oct. 1885. 
