no 
POPULAR SCIENCE REVIEW. 
comparatively greater in nickel than in liard steel, even when it is brought, 
like the steel, to a certain state of permanence by repeated heating and 
cooling. In this condition, the temperature-coefficient of a nickel-magnet 
is little greater than that of well-hardened steel. The temporary mag- 
netism acquired by pure nickel is about double its permanent magnetic 
moment, half the temporary magnetism acquired by hard steel, and one- 
fourth of that of soft iron. — (Bull. Acad. Set. de St. Petersb. tome xxiv., 
No. 1, p. 1.) 
ZOOLOGY. 
The Rhinoceroses. — Professor Brandt has communicated to the Academy of 
Sciences of St. Petersburg a synopsis of the family Rhinocerotidae. He 
divides the family into three subfamilies, namely : — 
I. Thysanodontes or Hippodontes , with rudimentary incisors, and molars 
resembling those of the horse. It includes the single fossil genus Elas- 
motherium. 
II. Aulonodontes , the typical rhinoceroses, destitute of canines and fre- 
quently with rudimentary incisors, furnished with molars with several roots, 
and with the crowns traversed by rather oblique transverse furrows. These 
are usually horned, and include the following genera : — 
1. Atelodus, Pomel, with the subgenera Tichorliinus, Brandt (antiquitatis 
and Merchii ), Mesorhinoceros , Brandt ( leptorhinus ), Colodus, Brandt, 
(pachygnathus) , and Colobognathus , Brandt (bicornis and simus ). 
2. Dyhopltts, Brandt (Schleiermacheri and [P] sansaniensis) . 
3. Ceratorhinus, Gray (sumatrensis, lasiotis, and cucullatus). 
4. Rhinoceros, Gray (sondaicus, uniewnis and inermis). 
5. Aceratheritjm, Kaup (incisivum, minutum and Goldfussii). 
III. Pcdceotheriodontes with six incisors and two canines in each jaw, and 
molars like those of the second subfamily. Includes only the fossil genus 
Hyracodon , Leidy. — Bull. Acad. Sci. de St. Petersb., tome xxiv., No. 1, 
p. 167. 
A Zoological Laboratory for the Channel Islands. — We learn that Mr. W. 
Saville Kent is now endea voicing to establish in Jersey, by the agency of a 
Limited Liability Company, a Museum and Laboratory of Marine Zoology 
and Institute of Pisciculture. He proposes to realize in Jersey the advan- 
tages at present furnished only by the Neapolitan Marine Aquarium and 
Zoological Station ; and at the same time to supplement the resources of the 
establishment, and promote the study of the animal inhabitants of the sea, 
by supplying zoologists in England and elsewhere with specimens of the 
creatures forming the rich and varied fauna of the shores of the Channel 
Islands. Scientific pisciculture is also to constitute one of the leading objects 
of the " Society.” Such an undertaking, if it can be carried out, cannot but 
furnish a new attraction to the numerous visitors to Jersey, and must exer- 
cise a beneficial influence on the study of marine natural history in this 
country, and we most heartily wish it success. Particulars of the proposed 
undertaking will be found in “ Nature ” for December 6, 1877. 
The Tape-worms of the Shrews. — In the number of this Review for July 
