In such a manner as to convey

The protagonist, Philip, who was born with a club foot, moved in with his uncle Mr. Carey, the Vicar of Blackstable after his mother's death.
The Caresy's friend Miss Wilkinson visited them to stay at Mr. Carey's for a couple of weeks.

...........................
She complained of the vulgarity of German life, and compared it bitterly with the brilliance of Paris, where she had spent a number of years. She did not say how many. She had been governess in the family of a fashionable portrait-painter, who had married a Jewish wife of means, and in their house she had met many distinguished people. She dazzled Philip with their names. Actors from the Comedie Francaise had come to the house frequently, and Coquelin, sitting next her at dinner, had told her he had never met a foreigner who spoke such perfect French. Alphonse Daudet had come also, and he had given her a copy of Sappho: he had promised to write her name in it, but she had
forgotten to remind him. She treasured the volume none the less and she would lend it to Philip. Then there was Maupassant. Miss Wilkinson with a rippling laugh looked at Philip knowingly. What a man, but what a writer!
Hayward had talked of Maupassant, and his reputation was not unknown to Philip.
"Did he make love to you?" he asked.
................................
"Do tell me all about him," he said excitedly.
"There's nothing to tell," she said truthfully, but in such a manner as to convey that three volumes would scarcely have contained the lurid facts.
"You mustn't be curious."
[Of Human Bondage by Somerset Maugham]
I'd like to know why it is "as to convey," not "as conveyed."
Thank you in advance for your help.