'A Calendar of Sonnets' by Helen Hunt Jackson is a delightful collection of twelve sonnets, one for each month of the year. Each sonnet vividly captures the essence of its respective month, painting vivid pictures of the changing seasons and their impact on nature and people alike. The sonnets are accompanied by beautiful illustrations that perfectly complement the words. Here's an excerpt from a sonnet dedicated to the month of June: "O month whose promise and fulfilment blend / And burst in one! it seems the earth can store / In all her roomy house no treasure more / Of all her wealth no farthing have to spend."