Dealing with the subject in a very able and interesting manner Mr Pettigrew grouped the British plants in the following way:—1st, rock plants; 2nd, marsh plants; 3rd, plants that love shade; 4th, silvestral plants; 5th, riparian plants; 6th, gregarious plants and a mixed race, detailing the natural order, genus, &c., of the several groups that go to make up the British flora.