45 



with Ca(NC3)2» the concentration of the first salt was 

 O.C0033in and the same concentrations of Ca(N02)2 were em- 

 ployed as in the series just described. The results in 

 these experimenta were similar to those of the previous 

 series, with some differences due to the lower concentrat- 

 ion of the lead salt. Practically no appressoria were form- 

 ed with the combination containing a 0.05m concentration of 

 ea(NC3)2i germination being here about ths same as that 



which occurred with a 0.000C2m concentration of the lead 



(see Fig. 5. ) 

 salt alon^. with a concentration of O.Clra Ca(N03)2 the same 



effect was obtained as with one of C.OO0C4m Pb(NC3)2 alone, 

 and with a C.OOSm concentration of the Ca(NC3)2 about the 

 same effect was evident as with a concentration of O.C0005m 

 Pb(N03)2 alone. In the combinations with O.CClm and O.OOCSm 

 Ca(NC3)p the results were practically the same as with a 

 concentration of 0.0001m Pb(N03)2 ^^O"^®* niost of the germiiv 

 ation here took the form of appressoria. 



With a C.00C16m concentration of Pb(NC3)2 in combin- 

 ation with the same concentrations of Ga(N03)2 as were em- 

 ployed in the two series above described, the concentration 

 of the calcium salt with the majority of the germinating 

 spores formed normal tubes ( instead of swellings and appr?es- 

 soria ), and the concentration which just allowed the form- 

 ation of normal tubes was somewhat lower than in the prev- 

 ious series, as was to be expected. The combination contain- 

 ing a 0.002m concentration of Ca(NC3)2 gave practically the 

 same effect as did a concentration of C.0C004m of the lead 

 salt alone, while that containing a O.COim concentration 



