FORTIETH ANNUAL REPORT. 71 



the Experiment Station contains a table showing the relation between 

 the Banniti reading and per cent of .sulphni' in solution. Also in obtain- 

 ing the strength of a solution for determining the amount of dilution, 

 the hydrometer is almost necessary. 



Q. Is that sediment of anj' value? 



Prof. Patten — I think where 3'ou use a good grade of lime one con- 

 taining a very low per cent of magnesia that sediment could be used 

 a second time to make a second boiling of lime-sulphur. Otherwise it 

 would be of no practical benefit to the farmer. 



Q. Don't you believe that we have reasons to think that the com- 

 panies use the Baume instead of giving the chemical tests? 



Prof. Patten — I do not know. We have not been able to make very 

 many analyses of samples of these so that I would not want to say. 



Q. Are we to understand that sample No. 2 is a Michigan lime oi' 

 a Maryland lime? 



Prof. Patten — That lime sample No. 2 is a Michigan lime put up by 

 the Michigan Lime Co. We got hold of it at the college; when we tried 

 to get some more they told us that they were not burning that lime any- 

 more; that Ihey burned just for chemical purposes. Whether they burn 

 this in any great quantities or not I am unable to say. If they have a 

 stratum of lime there which will give that analysis right through, they 

 will have a very great demand for it. 



Q. Is tliat the reason why it was necessary to send to Maryland to 

 get calcium which compare's with that sample No. 2^ 



Prof. Patten — There are deposits of lime stone in this state which 

 are very low in magnesia. .The Alpena Lime Co. puts up a grade of 

 lime which i-uns less than 1%. in magnesia. One sample which we 

 had showed that. 



Q. Is hydrated lime equal to the barrel lime? 



I*rof. Patlcn — I think (lie hydrated lime is just as good as the fresh 

 burned lime for when you use burned lime you do hydrate it. When 

 you put the water on it, yon hydi-ate it. If you have to ship that lime you 

 save some freight as .5G lbs. of burned lime are ecpial to 74 lbs. of hy- 

 drated lime. 



Q. Will an excess of lime added to dilution of commercially boiled 

 sulphur, let stand any time, deplete its influence for the work assigned. 



Prof. Patten — That bi'ings us a point which we have been working 

 on in the laboratory and it pu/zles us. It has been puzzling us for a 

 Aveek or so. There are points in connection with it Avliich we are un- 

 able to understand. If you take a sample of the clear lime-sulphur so- 

 lution and dilute that up with ordinary Avell Avater or tap Avater, it 

 immediately becomes cloudy, nnlkish and the sulphur begins to 'separ- 

 ate. There is enough carbonic acid gas in that water and other dis- 

 solved gases to bring about oxidization and precipitation of some of the 

 sulphur in that solution. If Ave take some lime and make a very thin 

 Avhitewash and then dilute the linie-snlphur with that whitewash, then 

 filter that out so that we have a clear solution, that remains clear and 

 will remain so for a long time and it does not seem to injure its vaHie 

 for spraying purposes in the least. In fact I am rather inclined to be- 

 lieve it is a benefit. 



Q. Would it not be all right to take up this matter of burned lime 



