Duck: Mendelism in Sheep Crosses 



413 



pure strain. Any ram that threw off- 

 colored or off- type lambs was discarded. 

 In the 1920 cross all the lambs thus 

 produced were black in color and the 

 fur, without exception, could not be 

 distinguished from that produced by 

 imported Karakul ewes or their off- 

 spring. 



Therefore, so long as the breeder is 



dealing only with allelomorphic charac- 

 ters which follow Mendel's first law of 

 dominance, recessiveness and segrega- 

 tion it is quite easy with a knowledge of 

 these basic principles to produce maxi- 

 mum results in minimum time. 



In a later article the Mendelian prin- 

 ciples underlying the appearance of an 

 occasional red lamb will be offered. 



Heterozygous Karakul Ewe Lambs Crossed on "Supposed" Homozygous Karakul Sire 

 Parent Offspring 



Evolution and Social Progress, 

 by Joseph Husslein, S.J., Ph.D. 

 Pp. 287. New York, P. J. Kenedy & 

 Sons, 1920. 



Dr. Husslein vehemently assails 

 "materialistic evolution," which he 

 says is the doctrine commonly taught. 

 and which he believes to imply atheism, 

 and to be subversive of morality. He 

 accepts "scientific evolution," which 

 he says is all of the evolutionary doc- 

 trine that is supported by actual facts, 

 as distinguished from the speculations 

 and hypotheses that pass for facts 

 with the materialistic philosophers. 

 The doctrine of evolution as thus quali- 

 fied seems to include (1) belief in the 

 existence of God as Creator; (2) accept- 

 ance of the evolution of the inorganic 

 world along the lines of the nebular 

 hypothesis; (3) belief in the creation 

 of an indefinite number of low types of 

 plants and animals, with evolution of 

 other forms from these original crea- 

 tions; (4) adherence to the idea that 

 man was specially created, perhaps 

 not more than 10,000 years ago, and is 



not a descendant of a lower or more 

 generalized type of animal; (5) suppo- 

 sition that religion, morality, social 

 organization, etc., are the products of 

 Divine revelation rather than of evolu- 

 tion as generally understood. Several 

 chapters are devoted to an attempt to 

 show that the first chapter of Genesis, 

 properly interpreted, is in accord with 

 the best modern scientific knowledge: 

 "either Moses knew as much about 

 science as we, or else he was inspired.' 

 It is difficult to review adequately, in a 

 scientific journal, a volume which is 

 written from a point of view so radi- 

 cally different from that of the world of 

 science. Dr. Husslein's book takes one 

 back to the period of Haeckel, Huxley, 

 Bishop Wilberforce and the Duke of 

 Argyll; but it marks some advance, at 

 least, in the attitude of the extreme 

 exponents of dogmatic theology. The 

 author makes the most of the inconsis- 

 tencies and differences of opinion of 

 the biological world, but he is not likely 

 to be convincing except to those who 

 want confirmation of their existing 

 convictions. — P. P. 



Former Numbers of the Journal Wanted 



The office of the Journal desires 

 copies of some previous issues of this 

 Journal as its supply is exhausted. If 

 any member will dispose of the follow- 



ing, please communicate with the 

 managing editor: January, February, 

 March, and April 1914; October 1918; 

 January, February, and April 1920. 



