56 NATURAL HISTORY MISCELLANY. 
and several seasons are frequently wasted in finding out this point- 
alone. The difficulties are greatly increased when the workers live 
at some distance from the coast, and instead of the slurs the writer 
seems to cast upon the work which has been so well done as far 
as it is intended to go (see paper to be issued in Memoirs Boston 
Soe. Nat. Hist. 1871), he might have spent some of his ingenuity 
in looking over the long list of marine animals, known to live on 
the coast of Great Britain, of which the development is unknown 
(many of which are fully as important as Limulus), and do what 
he could to fill the gaps. We might suggest to the reviewer the 
Spatangoids, the Ctenophore, the eggs of which can be more 
readily supplied to him than those of Limulus, from the English 
side of the Atlantic, and to come to more accessible material, 
any one of the many families of marine fishes of which we as yet 
know nothing, neither in England nor elsewhere. 
Readers of the Journal who are informed as to the progress of 
science will be astonished to hear of “ Hacken’s * law of individual 
development epitomizing paleontological development!” and to 
learn that A. Dohrn and E. Van Beneden are the great pioneers in 
the “speculations on the phylogeny of Arthropoda.” As the 
writer seems to have but a partial knowledge of what has been 
done in Germany and Russia, we would refer him to Siebold’s 
Zeitschrift for further information.—* * 
Tur Piczon Hawx.—In the September number of your jour- 
nal, Vol. iv, page 439, Mr. Winfred Stearns, of Amherst, com- 
ments upon Mr. Samuel’s statement that he never saw the nest of 
the Pigeon Hawk, and knows of but one instance in which it has 
ever been found in New England. Mr. Stearns thinks Mr. Sam- 
‘uel could not have inquired much into the matter, as he, Mr. 
Stearns, has found no less than three nests in that very town of 
Amherst. Unfortunately for Mr. Stearns’s statement, yet fortu- 
nately as enabling one to test the correctness of his alleged fact,’ 
he states that these nests were all in hollow trees. This is a condi- 
tion in which the nest of a Pigeon Hawk is never found, and one in 
which no other hawk than the Sparrow Hawk is ever found, demon- 
Sis aiies iS a A at a aa 
EA 
sia i ey of individual development epitomizing paleontological develop- 
count s ed sft Professor Agassiz’s teachings, as familiar to students in this 
aot so : cae old words. His statement of the law appears as early as 1857, a 
ia pgp on Classification being devoted to this subject. Agassiz also 
i w so early as the publication of the “Poissons Fossiles,” and 
Milne-Edwards referred to it in 1844 in the “ Annales des Sciences Naturelles.” ehh 
