298 STATE BOARD OF AGRICULTURE. 



soon as the first flowers showed. A few of the plants were slightly in- 

 jured by blight and nematodes but the results were not seriously affected. 

 In two cases the results with Earliana as the female parent were from 

 one plant rathe'r than from four because of a mistake in planting. The 

 experiment was discontinued on May 3rd. 



H GENERAL RESULTS IN 1907. 



The results corroborated those in 190G in almost every point . Those 

 blossoms pollinated Avith a small amount of pollen, on one side of the 

 stigma only, produced lopsided tomatoes, the cell on the side pollinated 

 having enlarged and not the others. The flowers fertilized with but one 

 pollen grain, or as few as possible, gave even more striking results than 

 in the previous year, as greater care was taken in pollinating. But very 

 few of the fruits formed had over two seeds, some none at all. The 

 tomatoes thus pollinated were very small and solid, no pulp being pres- 

 ent. The roughness of their skin was also characteristic and the fruit 

 was much duller in color. These fruits averaged but 35 grams in weight. 



The results from pollinating with a large and with a small amount 

 of pollen evenly distributed over the surface we're not as conclusive as 

 in the previous year. Stirling Castle tomatoes averaged 12 grams 

 heavier on the plant pollinated with a large amount of pollen. The 

 results of the two year's tests, however, indicate that the amount of 

 pollen does to a great extent determine the size of the tomato. They 

 show, however, that when a fair amount of pollen is applied evenly 

 over the stigma no smaller tomato results than when a large amount of 

 pollen is used, because the ability of the tomato to produce seed, and 

 hence large fruit, is limited. 



RESULTS OF CROSS-POLLINATION IN 1907. 

 Name of variety or cross. No. of fruits. weight^ 



Stirling Castle, self-pollinated 63 47 grams 



Stirling Castle X Earliana 67 50.8 grams 



Stirling Castle X Ignotum 75 47.4 grams 



Earliana, self-pollinated 38 106 grams 



Earliana X Stirling Castle 20 135 grams 



Earliana X Ignotum 60 108.5 grams 



Ignotum, self-pollinated 37 119 grams 



Ignotum X Stirling Castle 33 131 grams 



Ignotum X Earliana 39 13.4 grams 



Average weight of all self-pollinated fruits 77.6 grams 



Average weight of all cross-pollinated fruits 83.1 grams 



The self-pollinated blossoms set as well as the cross-pollinated. 



The average weight of cross-pollinated tomatoes in 1907 was 5.5 grams 

 greater than that of the self-pollinated fruits; in 1906 it was 1.9 grams. 

 In last year's experiment it was thought that cross-fertilization increased 

 the number of cells of certain varieties, but this was not shown in the 

 experiment of 1907. The number of cells in Stirling Castle (which gen- 

 erally has three cells, sometimes two or four), were noted in the crossed 

 and self-pollinated tomatoes, but no difference could be seen. 



