Natural History. ’•^Zoolog'y. 365 
New Ore of Nickel. — A new ore of nickel, made known 
but not described by Cronstedt, has been analysed by Professor 
Pfaff of Kiel. Its specific gravity is 6.129 ; and it is composed 
Nickel, 
24.42 
Arsenic, 
45.90 
Iron, 
10.46 
Sulphur, 
12.36 
93.14 
III. NATURAL HISTORA. 
ZOOLOGY. 
23. Notices of Works puhlisJiing in Italy on Human and Com- 
parative Anatomy. — A posthumous work of the late celebrated 
Paolo Mascagni (author of the splendid Views of the Lymphatic 
System) is now ready for publication at Florence. This work 
was begun so far back as the year 1787. His design is to ex- 
hibit, by a series of Engravings, connected views of all the parts 
of the Human Body, as they appear in nature, proceeding from 
the surface inward, in the order of the several layers of muscles. 
It was found, however, that to have united the absorbent ves- 
sels with the arteries, veins, and nerves, would have rendered 
the figures excessively complicated, and their demonstration con- 
fused and obscure ; wherefore, the bloodvessels and nerves 
alone, as they occur near the surface of the body, are exhibited 
in connection with the other organs. The better to characterise 
each system of organs, they will be represented in different styles 
of engraving ; so that muscular fibre shall at once be distinguish- 
ed from tendon or bone, arteries from veins and from nerves, 
&c. ; and still better to insure this object, in some copies, all the 
parts will be coloured according to nature. To preserve dis- 
tinctness and exact relative position of parts, each figure will be 
of a size not less than natural. The external superficies of the 
body will be contained in two figures, each about 3 braccia of 
Florence, or 5 feet of Paris. One will represent a front, and 
the other a back view ; and such parts as could not well be ex- 
hibited in the entire figure will be represented in separate views, 
of which there will be eight connected with the above two figures, 
representing the axilla, the mamma; the organs of generation, male 
