As for the collection of telegrams from street boxes, the very idea is in direct antagonism to the first principles of telegraphic communication. A street box may answer the purpose of a place of deposit for a letter intended for the next day’s mail, but those who desire to communicate by telegraph want immediate and speedy communication. They require their message conveyed, and very frequently answered, whilst they wait in the telegraph office. They have no idea of depositing their messages to await the diurnal collection from the street box. Indeed, the idea is too absurd to be seriously discussed. There are upwards of 100 telegraph offices in the city of New York alone, and a proportionate number of branch offices in all the cities. Is it probable that persons who wish to send a despatch will walk several miles to send it by government line rather than patronize private lines at their own doors? We cannot think that a department whose expenses exceed its receipts by $6,437,991.85 in a single year; which cannot even _guess within a hundred millions_ of the number of letters it transmits per annum; which provides only forty-six free delivery offices out of a total of 29,387 post-offices in the United States; which does not even pretend to give the number of letters delivered free for any one year; and which sends over 4,500,000 letters to the Dead-Letter Office per annum, is a very proper guardian of so important an interest as the Electric Telegraph. The space occupied for the various telegraph offices in all the principal cities of the United States is considerably greater than that required by the post-offices, while the rent paid by our company, owing to the more central and eligible situations of our offices, is greatly in excess of that paid by the Post-Office Department. In New York, our company pays $40,000 per annum for rent of its central office alone. So far as space and eligibility of location is concerned, we could much better accommodate the public by the delivery of their letters at our numerous offices, than they are now accommodated at the remote and inconvenient places provided for them by the government, and in all respects we could much better handle the mails than the post-office, as now located and generally conducted, could manage the telegraph. MR. WASHBURNE’S PROPOSED EXPERIMENTAL LINE. Mr. Washburne says:—