74 EXPEKIMEXT STATION EECOED. 



are born is significant. The value of the coefficient is in each case more than 

 11 times the probable error. The small positive correlation coefficients between 

 sizes of litters in which dams are born and sizes of litters in which their 

 offspring are born are decidedly significant when judged by probable errors. 

 There appears to be a small but significant correlation between sizes of litters 

 in which sires are born and sizes of litters in which their offspring are born- 

 It seems probable that this correlation should be attributed almost entirely, if 

 not wholly, to correlation between sires and male offspring. The correlations 

 seem to differ with the sexes. The correlation coefficients for sires and female 

 offspring are so small that their significance is much in doubt even with the 

 large numbers used. 



There appears to be a correlation between maternal granddams and offspring, 

 but there is no apparent correlation for the other grandparents and offspring. 

 It is pointed out that it would surely require immense numbers to establish 

 the significance of such correlation, if it exists. The means of arrays show 

 the small but general tendency of either or both twin parents and twin mater- 

 nal granddams to produce a larger proportion of twins than are protluced 

 when the corresponding individuals in the ancestry are singles. 



It is suggested that, as it requires large numbers to establish the significance 

 of the differences which have been found, it should not be surprising if within a 

 flix?k of no more than 100 there is in some cases even a larger percentage of 

 twins from single parents than from twin parents. 



Preliminary note on wool inheritance. V. G. Bahxy {Abs. in Rpt. Brit. 

 Assoc. A'lv. Sci.. 19 1^, pp. 65^, 655). — A cross was made between two Merino 

 rams and 20 Shropshire ewes. 31 Fi rams and 41 Fi ewes being obtainetl from 

 this cross. An Fi ram was mated to the Fi ewes, and from these 6 rams and 8 

 ewes were shorn. 



The range of qualities of the wool were as follows : Merino rams 64''. Shrop- 

 shire ewes 54 to 50", Fi rams 60 to 44", Fi ewes 60 to 50", Fj rams 60 to 54", and 

 Fi ewes CO to 54". There is a high range of variation in the F, generation, but 

 the great bulk of the Fi sheep are of a quality intermetliate between those of its 

 Merino and Shropshire parents. No accurate investigation has been made into 

 the amount of grease in fleeces, but it was seen that the Fi generation was 

 intermediate in this respect between the two parents. A microscopical investi- 

 gation of the average diameter of the fibers indicates that the great bulk of the 

 Fi sheep are intermediate as regards this character. 



It has been found that in order to obtain a probable error of less than 3 per 

 cent of the average of any sample it is necessary to take 160 measurements of 

 that sample. There is a large variation in the range of the weights of the Fi 

 fleeces. The F, generation is also intermediate as regards the number of waves 

 per inch. 



Feeding olive pomace to swine, C. GrcxoNi (Hod. Zooiatro, Parte Sci., 26 

 {1915), -Vo. 4, pp. l5}-l6o). — In feeding trials with swine, in which both fresh 

 and dried olive pomace were fed in addition to a basal ration of beans, corn, 

 and potatoes, the olive pomace compared favorably with a corn ration. The 

 fresh olive pomace is said to contain S9.9S per cent of dry matter, of which 5.36 

 per cent is digestible protein, 35.95 per cent digestible nitrogen-free extract, and 

 9.9S per cent digestible fat. and the dried pomace So.Tl per cent dry matter, of 

 which 5.69 per cent is digestible protein. 35.38 per cent digestible nitrogen-free 

 extract, and 1.7 per cent digestible fat. 



Seventeen years selection of a character showing sex-linked Mendelian 

 inheritance, R. Peabl {Amcr. .Vof.. 4-'' (1915). So. 5S6. pp. 595-SOS. tip. 1).— 

 A resume to date is given of an Investigation which was begun in 1S9S having 



