Jumiary, 1921. SCIENTIFIC A G R I C I' L T U R E. 33 



Table 4. 



Coefficient of 

 Subject. Relative Correlation 



Dist. Back to Frontof Keel.— Total Egrg Production 2530±.0377 



No. of Months Laid 1864±.0389 



Highest Monthly Egg Production 2965±.0368 



Egg Production Nov. 1— Feb. 28 1492^1.0394 



Egg Production Mar. 1— June 30 2334±:.0381 



Egg Production July 1— Oct. 31 1882±.0389 



Posterior End of Keel.— Total Egg Production 3684±.0348 



No. of Months Laid 3026±.0366 



" Highest Monthly Egg Production 3914±.0341 



Egg Production, Nov. 1— Feb. 28 2500±.0378 



Egg Production, Mar. 1— June 30 3322±:.03.59 



Egg Production, July 1— Oct. 31 3174±:.0362 



From results obtained by measuring 160 birds en- the liigher coefficients of correlation are to be expected, 

 tered in the sixth poultry egg laying competition at An interesting feature of these data i.s that in each case 

 Harper Adams College 1917-18, for length of keel, the coefficient of correlation is the greatest for highest 

 width at hips, distance between pelvic bonesi and size monthly egg production. This would seem to indicate 

 of abdomen it is concluded that size of abdomen is the that depth of body is rather closely correlated with in- 

 best indicator of laying capacity. This is decidedly tensity of egg production. 



not in agreement with the results of this experiment as 



will be seen from an examination of the tables, both (This article will be concluded in the February _ 



width at hips and distance between pelvic bones show- issue.) 



ing a higher correlation to total production. The ori- 



ginal reference is not available so there is no way of WORLD AGRICULTURE 



telling how this result was arrived at. jj.,„^. ,„e,ni,ei.s of the Canadian Society of Technical 



The three measurements from the back to the keel Agriculturists have recently received a complimentary 



described in connection with curvature of keel are the copy of "World Agriculture" and a request to sign 



only ones taken that give any indication in what way an enrolment form a^ members of t.'.ie World Agricul- 



depth of body is related to egg production. As has turc Society. The development of tllmt organization and 



been mentioned before the measurement to the posterior the ob.jects for which it stands are plainljl stated in 



end of the keel, while not a direct measurement of the enrolment form, and need not be emphasized here, 



depth, comes nearer to being that than the measure- The movement is world-wide, is receiving splendid 



ment to the front of the keel. The latter is so closel.v encouragement, and financial help received from 



correlated to the measurement back to middle of keel members is devoted only to the printing of "World 



that that measurement was not used for correlating Agriculture" and other necessary expenses. The 



with production. organization stands for educational advancement and 



The correlation of the measurement back to front of '« i" "o sense a commercial enterprise, 



keel to egg production is shown in table 4. The greatest During the past few months there has been close 



correlation is sho«ni with total production and intensity co-operation between the World Agriculture Society 



of production or highest monthly egg production. While and the C. S. T. A., through the Secretaries of the two 



there is no very marked increase in correlation from one organizations and Mr. Laurence H. Parker, of Amlierst. 



period to the next it is well to note that the correlation Mass., who is also the Editor of "World Agriculture" 



with egg production to March first is probably signifi- has already done iinich to bring the C. S. T. A. and its 



cantly less than for the later periods. The mean dis- official oi-gan to the notice of his world-wide audience, 



tance hack to front of keel was 12.5000±.0551 em for In many ways we can be, and should be, reciprocal. 



the 40 hens in laying condition and 12.0383 ±.0293 for Those who are directly associated with the World 



the 240 hens that were not la.ying showing that this Agriculture Society can always feel assured that they 



measurement varies with actual laying condition. have the sympathetic — and we hope financial — support 



Table 4 includes a similar set of data, as just con- :i^r,}l%';'(^'^}^^^^^^ SOCIETY OF 



sidered for the measurement back to posterior end of l^CHMCAL AItKII I blLKlblN. 

 keel. That this measurement is also dependent on Communications in regard to the World Agriculture 



laying condition is shown by the means 11.9775±.065o Society should be addressed to Laurence H. Parker, 



cm and 11.0817±.0361 cm for the layers and nonlayers Agricultural College, Amherst, Mass., U.S.A. 



respectively. There was also a great variation in range 



the laying hens varying from 10.80 to 13.79 cm while WHO'S WHO 



those that were not laying varied from 8.30 to 13.29 cm. 



There is also an appreciable difference between the From the membership <if the Canadian Society of 



correlation with production to March first and the Technical Agriculturists, an excellent "Who's Who 



other two periods which do not vary to any great ex- in Canadian Agriculture", might be prepared. Have 



tent. All the correlations are significantly higher for mir readers any suggesti(His to make in this matter? 



this measurement than the last. These two sets of data It might be possible to collect the Tiecessary material 



indicate that depth of body is correlated with egg pro- during the next .six months, and siihseqiiently publish 



(luction and since the latter mea.s\irement, a.s has bccri it in sections, in current issues of "Scientific Agri- 



pointed out, i.s the more direct measure of actual depth culture". 



