Dear Father

I am afraid that I have not been very successful in the weighing. In the first place the little bits had stuck rather firmly to the paper; it was difficult to get them off and in doing so a bit fell off the scale pan, but I am almost certain that I picked it all up. As to the weight I can only say that it was less than $\frac{1}{100}$ of a grain.¹ The scale turned fairly well to the $\frac{1}{100}$ but hardly shewed any movement with the bits on it.

I enclose two sets of D^r. D’s letters, as a spare one might be useful.² I have plenty more. Sorry not to have done better in the weighing.

Your affec son | Leonard Darwin