Miscellaneous Intelligence. 519 



the sixth edition ; it would manifestly have been unwise to fail 

 to make this change to-day. 



Many extremely perplexing questions of a minor character have 

 been well and skilfully met by the authors of the present revision. 

 One of these is the selection of illustrative helps. These are 

 incorporated in the body of the page, and are not too numerous to 

 be confusing. They are, for the most part, excellent and telling. 

 Another difficulty, and the last to which we shall now refer, was 

 the discrimination between forms in polymorphic genera where 

 such differences can be made to appear as specific instead of 

 varietal. The multiplying of these forms under the name of spe- 

 cies has introduced a question of the first magnitude. Of course, 

 one cannot expect to satisfy everybody even by compromises, 

 but such compromises seem to be demanded now and then. The 

 revisers, who may well be called the authors of the present 

 edition of Gray's Manual, have shown great ability in managing 

 these perplexing matters, and are to be congratulated on their 

 success. G. L. G. 



IV. Miscellaneous Scientific Intelligence. 



1. Carnegie Institution of Washington. — Recent publications 

 of the Carnegie Institution are given in the following list 

 (continued from p. 100): 



No. 39. Handbook of Learned Societies and Institutions. 

 America. Pp. viii, 592. 



No. 75. The Fossil Turtles of North America ; by Oliver 

 Perry Hay. Pp. iv, 568, with 113 plates; 4to. 



No. 85. (Massachusetts). Index of Economic Material in 

 Documents of the States of the United States. Massachusetts, 

 1789-1904. Prepared for the Department of Economics and 

 Sociology of the Carnegie Institution of Washington; by 

 Adelaide R. Hasse. Pp. 310, 4to. 



No. 87. Volume I, Parts I, II. The California Earthquake of 

 April 18, 1906 ; by Andrew C. Lawson, chairman. In collabo- 

 ration with G. K. Gilbert, H. F. Reid, J. C. Branner, and 

 others. Pp. xviii, 451, with 146 plates, 25 maps, 15 seismo- 

 grams ; 4to. Report of the State Earthquake Commission. In 

 two volumes and Atlas. 



No. 89. The Old Yellow Book. Source of Browning's The 

 Ring and the Book, in complete photo-reproduction with trans- 

 lation, essay, and notes ; by Charles W. Hodell. Pp. cclxii, 

 345, 4 plates. 



No. 94. The Structure and Life History of the Hay-Scented 

 Fern ; by Henry Shoemaker Conrad. Pp. 56, with 25 plates. 



No. 95. Papers of the Station for Experimental Evolutions, 

 No. 10. Inheritance in Canaries; by Charles B. Davenport. 

 Pp. 26, 3 plates. 



No. 99. Botanical Features of North American Deserts; by 

 Daniel Trembly MacDotjgal. Pp. Ill, 62 plates. 



No. 101. The Variation and Correlations of certain Taxo- 

 nomic Characters of Gryllus ; by Frank E. Lutz. Pp. 63. 



