72 



a. ni. ranpi-infjf from 18" F., on the ISth, to 54", on the 15th, and at 

 noon, Irotn .M ', on the ISth, to SS", on the 25th. There was an 

 unusual amount of wind from the southeast — on not less than 

 fourteen thiys out of the twiMity-two. Rain fell on six tlays, and a 

 liijht snow on one otlu-r. 'IMie first rain, on March 7, lasted for 

 two and a half hours, l)ut was very lij^ht — ahoul two <4"alh)ns for 

 each experimental tree acct)rtliny^ to Mr. Titus's estimate. The 

 temperature at the time was5(>'. On the ninth day after the bc- 

 JL^iuninjj of the first I'xperiment (March 11) the weather was 

 showery, with heavy mist most of the day, the temperature (>() to 

 (>4 '; ami on the thirleeiith ilay (March 15) a heavy shower of rain 

 fell, with hail, for an hour in the afternoon, ami)untinj^ to ten or 

 twelve }4alh)ns to the tree. The 17th and ISth were cold 2() in 

 the moruin<4 ami 24'"' at tu)on on the 17th, ami IB*-' in the mornin»; 

 and 24 at noon on the ISth. The wind blew stroiij^ and colil from 

 the nt)rthwest, with a li«4lit snow on the first of these days. A slow 

 driy</<lin*>- rain fell on the 2(Hli, bcf^inniiif;- at about five in the after- 

 noon and continuin*; throiij^li the nij^ht and all the followinj^ day. 

 The insecticide sprays were applied on the Mi, the 5th, and the 

 20th. March .^ was a partly cloudy day, with a colil raw wind 

 from the cast and northeast, the thermometer register inj^- M) at 7 

 a. m. and 4(»'-' at noon. The 5th was a clear day, with a northwest 

 wind, fairly strong-, the tliermometer .^0 at 7 a. m. and 45 at noon. 

 On the 2tUli the wind was from the southeast, with a threat of 

 storm which resulted in rain at live o'clock in the afternoon. The 

 tem{)erature was M at 7 a. m. and 57" at noon. 



pKlCl'AKA'nON ou ri\H iNSICCriOlDKS. 



The insecticide washes were prepared in substantially the 

 same manner. b\>r the t^alifornia wash, fifteen pounds of stone 

 lime wereslakeil in a little very hot water, fifteen pounds of gfround 

 sulphur being- slowly poured in during the slaking process with 

 constant stirring of the mixture. This was then boiled for an 

 hour, aller which fifteen pounds of salt wiu'e ailded and the boiling 

 continued for fifteen minutes longer. The whole was then poured 

 into a barrel through a strainer, and enough boiling water was 

 added to make fifty g-allons. In the preparation of the Oregon 

 wash a pound and a quarter of blue vitriol was used instead of the 

 salt, the crystals of the blue vitriol being dissolved in hot water 

 and the solution added slowly to the slaking lime. The apparatus 

 used was a Morrill and Morley pump, with twenty-five feet of hose 

 and a twelve-foot extension roil with a double N'ermorel no/./.le. 



