BY T. HARVEY JOHNSTON AND M. J. BANCKOFT. 309* 



Evidence of the effect of the weather on the " lumpy "' 

 condition already referred to, is afforded by the following 

 notes taken from Mr. Hull's letters. On Januarj' 9th, 1017, 

 he noted that nine of his resistant cows were shewing a 

 lumpy, knotted condition. Next day a sudden change 

 in the weather occurred. The barometer fell and a Avesterly 

 wind sprang up, the lumpy condition subsided Avithout any 

 extravasation of lymph. 



An attempt has been made to correlate the daily 

 temperature records taken during January and February^ 

 1918, with the exhibition of exudate. The accompanying 

 graph shews the results o1>tained by plotting maximum 

 temperature, humidity per cent, and per cent, of animals 

 shewing exudate, against each da_\'. It appears that there 

 is a rough correspondence between the three curves, the 

 humidit}' per cent. l)eing an inversion of the cither two. The 

 exudate appeared more abundantly on days of fairly high, 

 temperature accompanied by less humid conditions. The 

 humidity' was very high throughout — as might be expected 

 during the rainy season, so thcit the term " less humid " 

 is onlj' a relative one, meaning that there Mas less moisture 

 in the atmosphere than A\hen it was actualh' raining. 

 Although some rain fell on practically everj- day, the morn- 

 ings were freqiiently fine, warm and sultry (conditions- 

 favourable to the exudation), becoming stormj^ or showery 

 in the afternoon. 



Mr. Inigo Jones, Crohamhurst, however, finds that 

 the exudate appears on his cows in winter as well as summer. 



At the end of July, ^Vlr. Jones undertook to examine 

 several resistant cows at regular intervals throughout the 

 winter and note especially the presence (or absence) of ticks 

 and exudate. On September 23rd, he forwarded his report. 

 The four selected cows, Erminie, Queenie, Pocahontas and 

 Frida were examined on July loth and 30th, Atigust loth 

 and 30th, and September 15th. The exudate was visible 

 and normal on all occasions, and owing to the severity of 

 the winter and consequent low condition of the cattle a 

 few ticks were observed on each occasion. On August 

 15th, he reported that a calf. Rosy V., aged eight months, 

 the daughter of a resistant cow, showed a tj^pical exudate 

 for the first time. She was apparently tickless. Erminie 



