A correspondent writes that in our remarks on trees for public grounds some injustice might be done. Among articles furnished to the Boston authorities were some for which they paid $150 per 100. This was a subject for investigation by the city. It is contended that the price was not ex-horbitant, but was the regular wholesale rates of that grade of plants in this country. It is said that the investigating committee reported substantially to this effect. So far as this particular case may be referred to by our remarks, he thinks that one should be excluded.