S-na^ApmTAmT PROGRESS OF MICROSCOPICAL SCIENCE. 251 
Bejproduction of Limbs. — M. Philippeanx has proved for fisli what 
he had already demonstrated in the case of newts, viz. that when the 
limb is removed below the scapula or ilium it is reproduced. But 
when the scapula or ilium is removed, no reproduction takes place. — 
Comptes Bendus, March 15th. 
Pehrine Corpuscles in Silkworms' Eggs. — M. Cornaillat, who sent a 
paper on this subject which was read before the Academie des Sciences 
on the 15th ult., states that he has proved three points: — 1. That by 
establishing new centres of cultivation the disease may be checked. 
2. That the eggs resulting from the union of a "corpuscular" male 
and a healthy female are nevertheless sound. 3. That the ratio of 
corpuscles in the mother and the ovum are as 10 to 1. 
Enchondroma in an Ox. — At a recent sitting of the Vienna Academy 
of Sciences, Herr Rokitansky exhibited a specimen of this tumour in 
the skull of an ox. The tumour was remarkable for its great size, 
and for its texture, which was as hard as iron. 
Development of the AntJieridia in Sphagnum is the title of an instruc- 
tive paper, read before the Academy of Sciences, Vienna, by Professor 
Dr. H. Leitgeb, on the 11th of March, 1869. 
The Bulbous portion of the Arteries of the Placenta, formed the subject 
of a paper read at the same meeting by Professor Hyrtl. 
The Structure of Tendons. — M. Eanvier, who has been examining 
the structure of tendons, first stains them with ammoniacal solution 
of carmine, then washes with water, and finally acts on them with 
acetic acid. By this means he has been able to recognize — what no 
doubt represents the yellow, elastic element — a series of deeply-stained 
lines, which he says are bordered by a distinct envelope, and /ollow 
the longitudinal direction. He thinks that collectively the tendon 
consists of three parts: — First, of an epithelial layer; then of a portion 
of connective tissue, with large stellate cells ; and, finally, of the true 
tendon-tissue, such as is described above. — L'lnstitut, March 3rd. 
The Colour-reaction of Lichens. — Dr. Lauder Lindsay controverts 
the opinion of Dr. Nylander and Mr. Leighton, that colour-reaction 
is a specific test of Lichens. In a paper read before the Botanical 
Society of Edinburgh, on the 11th of February, he stated the follow- 
ing conclusions : — 1. The same specimen, in the hands of the same 
operator, in its different parts, at different times, frequently exhibits 
colour-reactions different at least in degree. 2. The same species, in 
the hands of the same operator, and, still more so, in those of different 
experimenters, in different specimens from the same or different lo- 
calities, differing in freshness of collection or age, occurring in different 
varieties of forms, or in different conditions of growth (fertile or sterile, 
liypertrophied or degenerated), frequently shows colour-reactions dif- 
fering equally in kind and degree. 3. Colorific quality is determined 
by circumstances (not fully imderstood) connected with (a) locality of 
growth in relation to climatic, geographical, topographical, geological, 
or other conditions ; (b) states of development, in relation to sterility, 
hypertrophy, or degeneration of the vegetable tissues proper. 4. This 
inconstancy of colorific property leads the orchil manufacturer never 
VOL. I. T 
